Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

public class Test { public static void main(String ar[]) { Integer a = 10; Integer b =10; Integer c = 145; Integer d = 145; System.out.println(a==b); System.out.println(c==d); } }

iGate,

7 12928

How to prevent to create multiple objects of a java class?

ASD Lab, TCS,

3 8867

What is OOPS Concept?

Cap Gemini,

1 4852

What is access modifiers?

Cap Gemini,

1 4269

Explain JSP life cycle

Cap Gemini,

1 3946

How do you implement polymorphism in our day to day life?

Cap Gemini,

3182

What is design pattern and there types?

Cap Gemini,

2 6364

What is aggregation?

Cap Gemini,

1 3868

solve this is my problem byte a=40,byte b=50 both add value is 90 this is with in range of byte... byte range is -128to 127.... why this pgm gives error like type mismatch.... package javapgms; public class byte1 { public static void main(String args[]) { byte a=40,b=50; byte c=a+b; System.out.println(c); } } note : dont use int k... a,b,c are in byte range... mind it..

2 6181

Why Static variable required in java?For ex,class A { static int a; int b; } Why static is required?

Ericsson,

5 8685

Why method overloading and method overriding required in java?

Ericsson, Wipro,

1 4981

In collection sorting comparable and comparator interface will be used..but why this two interfaces required..two will work same purpose so why there are two interfaces instead of one?when to use comparator and when to use comparable?

Ericsson,

1 4808

What is OOPs & Why?

3 5017

String is mutable or immutable?

3 6611

INTERVIEW QUESTION FOR ANDROID

2080

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Un-Answered Questions { Core Java }

What is the nested interface?

1046

Explain about abstract classes in java?

989

Can you make a constructor final in Java?

1074

What is a databasemetadata?

903

What is unicode in java?

890

Compare java and python.

942

What is javac_g?

977

Is class is a data type?

1032

What is stream api in java8?

1088

How do you invoke a method?

960

What access modifiers can be used for class ?

979

What is finally block?

987

Can a main method be overloaded?

972

Is sizeof a preprocessor?

951

What does n mean in java?

930

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